cornell



(No Model.) 3 Sheets-Sheet 2. J. M. CORNELL. GIRDER BRAGING TIE BAR.

No. 495,785. Patented-Apr. 18, 1893.

PETERS co vnovoglmo. wAsHmuTum D. c.

3 Sheets-Sheet 3.

(No Model.)

J M CORNELL GfIRDlEIRA BRAGING TIB BAR.

No. 495,785. Patented Apr. 18, 189.3.

Ullllllll UNITED STATES PATENT OFFICE.

JOHN M. ooRNELL, OE NEW YORK, N. v.4

GIRDER-BRACING TIE-BR.

SPECIFICATION forming part of Letters Patent No. 495,785, dated April 18, 1893.

Application tiled December 2l, 1892. Serial Non/155,920. (No model.)

To a/ZZ whom, it may concern-.-

g Beit known thatI, JOHN M. CORNELL, a citizen of the United States, and a resident of New York, in the State of New York, have invented a new and useful Improvement in Girder- Bracing Tie-Bars, of which the following is a specitication.

The object of this invention is to furnish builders with girder-bracing tie bars which will hold girder-beams perpendicular when the thrust of an inter-girder arch comes on them at bottom or at and immediately aboveu their bottom flanges, and which will be at the same time above the intrados of the arch so as not to show underneath.

The invention consists in certain novel combinations of parts as hereinafter set forth and claimed.

Three sheets of drawings accompany this specification as part thereof.

Figures 1, 2 and 3 on Sheet l of these drawings represent vertical cross sections through pairs of girder-beams braced according to this invention, the tie bars being of one and the same system and shown in elevation. Figs. 4., 5 and 6, Sheet 2, are a like series of views showing a modified system of the iinproved tie bars. Fig. 4n is a section on the line a-a Fig. 4. Fig. 5b is a section on the line b--h Fig. and Fig. 6c is asection on the line c-c Fig. G. Figs. 7 7d and 7e, Sheet 3, are respectively a vertical cross-section, a top View, and a section on the linee-e Fig. 7, showing another modication of the same invention.

Like reference letters and numbers indicate corresponding parts in the several figures.

Givena pair of girder beams or girders, A B or A2 B2 or A3 B3, simple or built up, and of the vsame or different heights, the bottom flanges of which are to support an arch C of# hollow tiles 0r other material suitable for arches, I brace the same, at one or more points as may be required, by means of a composite tie bar, or system of tie bars, D, Figs. 1, 2 and 3, or D2, Figs. 4 4a, or D3, Figs. 5 5b and 6 6c, or D4 Figs. 7 7d 70', suitably attached to the girders, and adapted to keep the girders perpendicular, as above, Without showing under the arch, and without any projection above the top of the arch at its crown, or above the plane d d Fig. 7, of the tops of the girders.

in each of the arrangements represented by the drawings, the improved tie-bar is composed of one or more main bars 10 ofv fiat bariron or the like, on edge, extending horizontally from girder to girder, and attached by bolts (or rivets) 11 or riveted knees 12 to the respective girders, at such a height that the lower edge of the bar `at midlength will be above the intrados of the arch at its crown, and one or more supplemental bars or rods 13, attached to said main bar or bars at 14, eX- tending obliquely downward therefrom beneath the respective ends of the compound tie bar to the lower portion or bottom of each girder, and there attached to the latter by bolts (or rivets) 15, hooks 16 or screw-nuts and washers 17.

' In the primary arrangement represented at D, Figs. 1, 2 and 3, the main member 10 is a single straight bar of ilat bar-iron of suitable dimensions, with its ends bent and drilled to coact with said bolts (or rivets) 11, .and there is a single supplemental member 13 of flat iron or steel to each tiebar, the same being bent edgewise so as to have a horizontal portion at midlength, which, said bar 13 being riveted fast to the main bar 10 at 14, reinforces the latter in an effective manner.

In the modified arrangements represented at D2 D3 and D4 in Figs. 4. 43J 5 5b 6 6 and 7 7d 7e the main member 10 of the tie'bar is in each case composed of two channel bars back to back, with their webs vertical, and with knees l2 riveted to their ends at both sides of the double bar and at its bottom, and attached by means of these knees to the webs of the girders; and the supplemental members 13 are, in common, short bars or rods, the upper ends of which are held or attached between said channel bars at 14.

The supplemental members 13 represented in Figs. 4 4a are of flat metal, twisted and hooked as shown, riveted fast at 14 between the otherwise closely adjoining channel-bars of the companion main member 10, and interlocked with the girders (A B) at bottom by means of said hooks 16. rlhose represented at 13 in Figs. 5 5b and 6 6c are in common short rods of round iron, with upper ends iiattened and riveted fast at 14 between otherwise closely-adj oining channel bars, as in said arrangement represented in Figs. 4 4a, while IOO their lower ends are attached to the webs of the girders at bottom by screw-nuts and beveled washers 17.

The channel-bars constituting the main tiebar member represented at 10 in Figs. 7 7l1 and 7 e are separated as shown so as to admit the body of a cast block 18 between them at midlength. Flanges on the sides of the block at top rest on the channel-bars, as at 19 in Fig. 7, and the block is made fast to said channel-bars by horizontal bolts (or rivets) as at 20 in Figs. 7 and 7, and forms part of the means for attaching to said main member the supplemental tie-bar members presented at 13 in the same figures. The latter are in this case simple round-iron rods; their lower ends being attached to the webs of the girders by nuts and washers 17 as before described, while their upper ends extend through oblique holes in said block 18, as indicated by dotted lines in the several figures, and are provided with nutshaving seats at the proper angles on said block at top, as at 2l in Figs. 7 and 71. It will be apparent that in each arrangement the ends of the tie bars may be attached to the girders in any ofthe ways above described or by other like fastenings; and other analogous moditications will suggest themselves to those skilled in the art.

The improved tie bar is shown only between the outermost pair of a series of girders, adjoining a side or end wall or partition E. It is intended to be used however between each pair of girders, or wherever it may be required.,

Having thus described the said improvement, I claim as my invention and desire to patent under this specification- 1. In combination with a pair of arch-supporting girders in which the lateral thrust of the arch is upon the girders at bottom, an improved tie-bar composed of a main bar or bars of fiat bar-iron or the like, on edge, eX- tending horizontally from girder to girder above the intrados of the arch at its crown, and one or more supplemental bars or rods, attached to the main bar or bars, and extending obliquely downward therefrom beneath the respective ends of the compound tie-bar to the respective girders, and there attached to the latter, substantially as hereinbefore specified.

2. A compound tie bar composed of a straight main bar ot' dat bar-iron, on edge, and a supplemental flat bar, bent edgewise at a distance from each end, and having a straight midlength portion which is riveted fast to said main bar, and reinforces the latter, in combination with a pair of arch-supporting girders in which the lateral thrust of the arch is upon the girders at bottom, an arch the intrados of which is below the tiebar at all points, and attaching devices Whereby both members of the tie bar are attached tothe respective girders at both ends, substantially as hereinbefore specified.

JOHN M. CORNELL. Witnesses:

EDWIN MARSHALL, H. A. CARROLL. 

